The phrase "a transformative period" is correct and usable in written English.
It can be used to describe a time of significant change or development in a person's life, a society, or an organization.
Example: "The 1960s were a transformative period for civil rights in the United States."
Alternatives: "a pivotal time" or "a significant era".
His return this year, Mr. Gee said, closes the loop on a transformative period in the university's history.
Sadly, that's not happening so much now, because people can't afford it, but often that was a transformative period.
He was appointed chief executive in 2004, overseeing a transformative period when Lego's losses turned into profit and revenue increased five-fold to 35.8bn kroner (£4.1bn) in 2015.
Baseball is supposed to be a conservative game, but every once in a while it goes through a transformative period: the 1960's, for example.
Old strategies become obsolete and new ones are called for.The finance industry is in the midst of a transformative period of evolution, and financial economists have a huge agenda to tackle.
We accompany Wasserstein to all-female Mount Holyoke during a time that Salamon summarizes in a shorthand that can flatten her descriptions of historical moments: "The four-year period that encompassed Wendy's years as a student at Mount Holyoke College, 1967 to 1971, would be remembered by a generation as a transformative period when attitudes seemed to change overnight".
The first tools in any transformative period are hard coded to the sensibilities of the radicals, the pioneers on the front lines.
"Just as the Gilded Age was followed by the progressive era, and the roaring nineteen-twenties were followed by the New Deal, and just as the postwar Eisenhower years were followed by the Kennedy-Johnson period, which was a very transformative period of policies.
Is it fair to say that we're now entering a similarly transformative period?
Monáe has said about the recording sessions "Over the last year and a half when we were recording the ArchAndroid I went through a very transformative period in my life".
The early 21st century was a tumultuous yet transformative period in Nepal's governmental history.
